The aluminum slant back roof vent provides 50 square inches of net free area and will ventilate an area up to 94 square feet. It is louvered on three sides for maximum air flow. The flashing dimensions are 16-3/4"x18-3/4". The 9-1/2" opening fits between 16" on center rafters. There is an 8"x8" aluminum screen. It fits 3/12 to 10/12 roof pitches. Color is mill.